Multiband Massive Channel Random Access in Ultra-Reliable Low-Latency Communication
Multiband Massive Channel Random Access in Ultra-Reliable Low-Latency Communication
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DOI：
10.1109/access.2020.2989772
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发表时间：
2020
期刊：
影响因子：
3.9
通讯作者：
A. Hossain;Zhenni Pan;Megumi Saito;Jiang Liu;S. Shimamoto
中科院分区：
文献类型：
--
作者：
A. Hossain;Zhenni Pan;Megumi Saito;Jiang Liu;S. Shimamoto
超可靠低延迟通信（URLLC）是具有挑战性的，由于其极高的可靠性要求与严格的短延迟数据包传输。为了克服这种可靠性和延迟限制，通信接入方案需要确保几乎无差错和高速分组传输。针对URLLC的高适应性，提出了一种新的多址接入方案--基于正交频率子载波的多址接入（OFSMA）。在该方案中，分组分集的概念被纳入，以实现预期的分组传输可靠性和不同数量的复制的分组被处理的一组操作和随机选择的正交子载波频率信道上发送。OFSMA系统的性能测量方面，应用几个数量的频带，大量的子载波信道，不同数量的分组重复，和不同的流量到达条件的速率。我们确定了子载波信道的最小数量的要求，以满足99.999%的可靠性为不同的数据包复制存在不同的频带。对于不同的频带条件下的子载波信道的固定数量的可靠性响应进行评估。最后，测量了OFSMA系统的空中接口延迟，并与传统OFDMA系统的空中接口延迟进行了比较。可靠性和延迟方面的性能结果表明，OFSMA方案可以保证URLLC定义的预期可靠性和延迟。
Ultra-Reliable Low-Latency Communication (URLLC) is challenging due to its extremely higher reliability requirement with stringent short latency packet transmission. In order to overcome this reliability and latency bound, a communication access scheme needs to assure almost error-free and high speed packet transmission. In this paper, a new multiple-access scheme—Orthogonal Frequency-Subcarrier-based Multiple Access (OFSMA)—is proposed with URLLC’s high requirement adaptation. In this scheme, the packet diversity concept is incorporated to achieve the expected packet transmission reliability and a diverse number of the duplicated packet are processed with a set of operations and transmitted over randomly selected orthogonal subcarrier frequency channels. Performances of the OFSMA system are measured in terms of applying several numbers of frequency bands, a massive number of subcarrier channels, a different number of packet duplications, and a diverse rate of traffic arrival conditions. We determined the minimum number of subcarrier channels requirement to satisfy the reliability of 99.999% for different packet duplication in presence of different frequency bands. The reliability response for a fixed number of subcarrier channels is evaluated for different frequency band conditions. Finally, the air interface latency of the OFSMA system is measured for single packet uplink transmission and compared with that of a traditional OFDMA system. The performance results in terms of reliability and latency express that the OFSMA scheme can assure the expected reliability and latency defined by URLLC.